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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7925178b6b2fbc1fa662f341e45cddddb2611a54d622c4dd78930af64f9bbce9' 
  AND token = 'ea02k6bZVJ5FNtN1nEHfi1JPtp/jJwihBf1cBr0gPN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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