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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0d43fdd2832f9565fff343800119c1c1a5e6b5237138b664a03398edab8bd5' 
  AND token = 'uOsd8M3J9QpfKgy4Ja945hKU4MjRdEJI+BMT/3lImsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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