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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a356f2d52841703475b8987a9a9655ec7d9ba9cb16bf10f0a1ab4157b5c53b1' 
  AND token = 'aR1mZ9L0Y8JL8kOhT3bphSU1oGrEqubQsB6bWHlTCSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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