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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90708fd5bac3ba08efec2cd53100f86e0c09c0e50637ef177bcb7296ffdb0ba' 
  AND token = 'VCrjO0c2zKzCk98Ckn8Q+eD7sUpDEZ1x3ST3dkQLKV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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