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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709c09a9a82ceca184e6e0facf2446a90ae8ca4f7ac951c283a00760cab52019' 
  AND token = 'vjAgu1+XeLc8Ws+a+HdpiIftiXsseB5YWE7cErvMXb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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