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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80688c61b4a1d323670ddee3a4af7f06f03a1dc7697409afd0e468c2ff084765' 
  AND token = 'KzpLNR2klYA9ePI8PtR8lsaJmRGgN8NqaM/UHTw6//M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}