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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be368be26535a17b6a881c8d48c271f721897314faa96fdd1fece6fe712a80a8' 
  AND token = 'cPyLzgcoEHNFlycHwXNtN6uWspObmr1yfcPuGR5A/ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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