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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eabd3ad7a526fa60b28ba8ed2362231a66009e811e3e35f15651cb2b35f52e9' 
  AND token = 'H136JzPubKJTSpn5SDhbde5km+YBUmpP5ny1T+UMrHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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