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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becd480f46aead847c8f2aa74b2fc21ceabc61b86089ebf02c7df0e2ea3b8ec3' 
  AND token = 'HmeK5ZJOkTAykIwPfNIkBcLeaj09F94DqCknvV3GfRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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