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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91d1f2987e1bcb4ddd04b7ae00164d3c7d9bc8696a05e2509eb2a7f4b07fc34' 
  AND token = '7U0J+Xo4dDWJH1tcRdoMlIy/HNpLC9Mg8sU9doE4aBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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