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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e845e29079b998abdbe72ed2a8a2682db0ee4f8845c0b0dc464f6673b8572749' 
  AND token = 'KjeeqzxyKPmKxL3/cih4yHZjbSANV6XrBDQfk+3N9L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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