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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a87940833e9874d6e612dbdb559f5a6f8c7246381a0c81372d138bef21eae49' 
  AND token = 'jAKXi8nys2tDU6WiSrlW7PdQ69TXM5WJGPjgIFj6fZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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