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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd679a1b3aedf3e22ab0b5f4f450f1b8e583a0a01bc4596bb51984c2b380e0db5' 
  AND token = 'gplJ8N/jnjzbWZrWBB2mA/k9MleJo6bj5l/nsP+LVSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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