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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0356050087afca3ba632206c5063a5fced62620840005f35da7d8d2e2f55e6' 
  AND token = '7xU7Lz/hWCF9vbAVvbATe1cf0Ap1ym92SH2573AHuVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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