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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752422029b97a0296f5c9bce755bb77a6ade4bd8b776ffc2c9fd4c280ba4144e' 
  AND token = 'Ph/RY1w/YumpUt/Of8ODdAt8d2s3/44+q+Xgkozj1jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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