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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a3ee58749fa0429c6f80d4718cb2fc66676614dcc451c6252f5c3a03c3a673' 
  AND token = 'LJUv/f7ri1zHiLFStJSO016/fgJ1OAoN1JEZj8aqWjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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