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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c667044cda0e54bb527a61609d9ad240ec7ee377fe41e021121584f885b833e3' 
  AND token = '9s83NPAohM0TN85pofVj2hOU5u69BFg27Holf06AFsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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