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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977c3dc7bb03d17f4bb150cd753e3884d759dc33d2a7609b8777e9e872e936fc' 
  AND token = 'jXEGP1JqrnMZZEEV8Q+mHaZs9a67gGAsQzy6WbSuvTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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