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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca0713a16b641cea992544963980bf49160d9e757bfbe30367bc959acf7f1d2' 
  AND token = 'bn6g9OdwO2TrZybJz68Wpukr2l5rLiRnc4gGt77pVy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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