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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071635933b5941e35c07e41c12e661c1129384196edd7bc68c527739a4e99444' 
  AND token = '55S4d62zQH1MPinx571SzdR0iSdeNTbzfzP8Ml6KswM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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