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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0c6dfd7726feeb66b8daeefda6dd2055f08761a09381ed6b5b08cc15b9a5e3' 
  AND token = 'rxh4dVoeE2f4QnuxAtsl2gtgv9nTnzRSPLSmZ4gMNMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00859

JSON explain

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