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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbac34257b4d8ebd95d8037ab32325fff6788edc98fa83cb1af76af61db7f7b' 
  AND token = 'kBXLM1iFnsVX3r+oF/kYeFwo88WD/M2J4zo+WTMJpJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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