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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45be084e45755f55f1ccac6862b2e1854e7e6f88d3e1922afead69aaec35ede4' 
  AND token = 'NMmrHfPomV9pad7Y/s9Wwe3/lXvhGcqoun8JkDeWc5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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