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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f32d9ff5c6fb29a4b0de81ea8501a2077b681ad6b9597af1330602a3fb09d42' 
  AND token = '7JKnsx6tRahWsQYpLM13N7FtrQVokc4k2Fz6pFXOlnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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