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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9485f18da012d28df5dd6b89a396d565f19dcede92c3aa672b03fcd388c9ff31' 
  AND token = '3vqjHsbfKEOe8nm+n9N3BslDuTo6f7lvJSgdc7RHakU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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