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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a85a0dda60a26d357028734bf95a40a88a1cb14d6e1dd655a3b152ea632fe3' 
  AND token = 'xHSuEns1gyeb8PlaxYtxu+OzIeHmmRqy9L86WBvGdyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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