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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea8552336ca741b33f5afb0c9b37f1ca98d6eb07e49876c30202af2e2bf986e' 
  AND token = 'i7g/PCvhgxU1nl8YmCUHdNEbyk4BmYux4S/lumEw9sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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