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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4920ac70c0b5bd670b4053a4de25367f7778cbe9fa1c6d874a8e6ef9917ea5d1' 
  AND token = '5ohcHjBhTbS6a+EJ0ody+z7XfDAY2eXdLnEotCcugY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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