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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d71851e8849c956ce406493153b02bdbc2d803ef89c9cd7093c0c3a5c7291a9' 
  AND token = 'jA5FpODdAIUF7gkiDB8tyKiahdBRJ7pXpKHDZE687u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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