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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20351c48b991eadfd5024e2df69fb076307562ebc1326c09ead2bd60cb6732e' 
  AND token = 'Aep+WIJZUjYAeoJcl3Mbk3afzVxtyQEHLzsTyDsCbm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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