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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b4f95cd8c1ec75695028b063fc62222a22f018aa9c9c87172196d3fbe306de' 
  AND token = 'NYH7PfmUSOEm+ipy+toybr6TPrK5n49e27IgvFlxRKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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