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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e24a2fe68b1168bb23e4f7274a1bde4ae7acc3ef7dec07e47764fd2f30be5c' 
  AND token = 'qe3ruAXeWcgXTNw7SjSXwEA8xAZXAzRu5cTSrSm6SGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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