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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e028ed538e86f9f7ebb3fcd38da7ebf155272b4f9020b5c382983f3db02264' 
  AND token = 'JvRaqXk1UIumxkkyNSDV1LLcc4h49Z1HqPcKsMFEvwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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