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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4593186f316e683b3954b85660984d8ec0e7e810c6fe148f9b8d334ee51de6' 
  AND token = 'd4z4BTX90+Rn0cacGSe3t9oRED+bE9zSRcyUI0Kkeu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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