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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6119f70558b15e704e311ed87fdedbba8b5268dc613ee1c6174685d73bbfadd' 
  AND token = 'LP90l8fNzPw6M8zrj5QeM+AdNlmLZ77c11SnqhTRJNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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