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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213deb933b8227215622aff58080d34df41eee46ca7e30dc5d032085132cff61' 
  AND token = 'rTJknt2rUJbA55mU5w8rAzLgrl3OFUjR19Q1vSx2YnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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