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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41a646994a9002434938c72b19be11c1960c220f57296b554e9f405c62745bb' 
  AND token = 'Df4tgJgeNt9Oi5k51P5kuhG4CVXHNLGV1gkRyf2tIeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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