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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118425bf3c2f67bebcd20ec2a6ec03e7e806b477ef6ef069aa6d56ab819a2f7d' 
  AND token = 'yxuBRdbDSjACgjA9HK2YPZAAF509snTSvP29Wj9y7l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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