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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b33ce88dd9430ebc670ef6a6bf6cf2388bf29f41cd76e8830ca8532944e23f5' 
  AND token = 'YYkiCvSq6IBfDediYNAx6kj6FrDjPtJGk82/KBI985I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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