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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a4041aec335a9745ac16c9895434bc50658144051625591d887771bb34a93b' 
  AND token = 'FqrKUveb1y9F4a1juIFm2JHC7wMOQ3h+34uqi1Y0N+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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