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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110c3be2a8b9c5372c015f9cae5e9ae8846e794a3d67459c045c0ddc4b2991b9' 
  AND token = '5b/dspIwZ0zp3Slj8mjJst+COZHoTQmcXxBOwS+MlIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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