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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1dabc72462400555417289619cd0c8b6ca9eb7766a9946caa0d730a4ca6313' 
  AND token = 'oB0o92mHV3UDStwYAgORPUBf9CrKxhqY1AHmL1Jsnc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01076

JSON explain

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