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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9beffec547c8ba65b0c96ab2c71c866c21e87b9da7e6aea9a6221d198771520e' 
  AND token = '3tBrBJlqmVufrJtN6ywK4xUkWhs2XqiYEcGSyjHw3sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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