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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97dbbe4a39b843025e96001dc4d9f5e27582b0e3bc43cba38d5680960d73b6e8' 
  AND token = 'OH3gaCH9WvjnF5VYhXPvEF0ioi1LBNCsUsTQm44b2xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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