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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543c355617e377d77bc84d6edebcdfe92f14af787b21754ae01d3395b69319f4' 
  AND token = 'P+sMkZaOY6JBrhuT1CPeZdyNoI8+m0XkLAjq2SAFU58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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