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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ef6810dad8d3b569b711a5eabeb409930fe4ce3c0f87f29552da274a8005da' 
  AND token = 'f2ZD+nuGm/SSO1qbRWygzFo9pWLhL7brmRoR6ftNZcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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