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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4363213725eee293d9eca5f2a011f74a2dae50c03467593e3495b58fe380d18' 
  AND token = 'vjmo6Um9nWK0xI+ms6c80j2/DeN7o0LDEUZo1neCNFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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