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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f202af30cd297b3169721d8c65b95a5d3df71b41bc9578f65dfc632f298e4ef' 
  AND token = 'lTvURDDK2D+mXgrX8t754SWkwFj81JES07pe6ijVUec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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