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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa7fc7405c3cffc988e408b91b9936529656a1f08dec67e122bd3f0e960d4af' 
  AND token = 'clkpk+Vgtshv9afUyDH0l2KW6ebCYY2aFTTttCVw6lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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