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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f760d4934338abc47bf170999ec6d9fdbc9bd6734a861c8343485d914412e50' 
  AND token = 'NwC/PC4TiLayCJAqpQDnegaoE9y1mGm1fEaCIMLnekY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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