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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35768cc466e1df6377b62fafe69f49253402b10aad04788562aebddc824a5838' 
  AND token = 'K1sPr1g1RdTUJDZBr37SsQ7SXxokNZtoEOVHIu0qhsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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