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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0222f3af292aaa9ba44cdab6113525eb6d1681ba1b68c511daca385c9d9c54ac' 
  AND token = '5WA/0I9KGhwd9LAPcUDmOtM6kI4ito9nY6LllOHyTbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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