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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97591ef37320ea88156e690dcb100fd6b27aacb4fd72565a6e55c1e90d2e11f3' 
  AND token = 'R6MPVxxnHB4b9te6tBEHmQ9JHMvxzQaLuApynD1sZiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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