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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace40dc3ef78f17a9d5547bcfa87cf4284086b066f10a15f02b6550555336307' 
  AND token = 'YkJjtBUp/nCmCdjzUQchqUk+P4jbINBQdf/Jfr1Eq7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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