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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26fd610cea9d13a5b78e9429308a7370eb1c536120c4b5d526c1da821368a6d2' 
  AND token = '6ALIOnxUDQdIckioqgDHAMHyKE7CNn1gHJM0yRcr/P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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