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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e888b3fe51a62e9c02e8e4150c7162b3e042902fc9e966f509d0e93a2c84b62' 
  AND token = '5aeN543mIZEXHW5ue8Mif9goxNdJ1bh0kgk0lfz+DS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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