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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad973db8afd408784560865efa08524301350dd5c6fc81c4f9e22df932e147da' 
  AND token = '2sif/5iRaHp5BgxkYrgNzzpEcD0Gnx/fRNThJDQ/xI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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