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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1552f82313b008a46ac090f6173d7aaa6cd695fb9fc54ff9882603e92bc10d7' 
  AND token = 'ML8gvvv60ZbFegh7g9JPekufgu3x2Lw8ylEoGLc1WwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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