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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26bdb58bb8757297da8d5a28d1e2c34c42dba95e593fbebec31c155bad4f8f4' 
  AND token = '7vSwXSuk0isopM5eHJnXNGn+dksA/99/NtmfG4D2NRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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